What is a dexamethasone challenge?
A) Depressed individuals are given a synthetic glucocorticoid to see if it shuts the HPA axis down.
B) Depressed individuals are given a synthetic CRF to try to "jump start" the HPA axis.
C) Depressed individuals are given a form of ACTH to shut the HPA axis down and allow it time for recovery from stress over-responding.
D) Depressed individuals are given a glucocorticoid blocker to regulate an out-of-control system.
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